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28 March 2024
 
  » arxiv » 2209.00758

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Real-space BCS-BEC crossover in FeSe monolayer
Haicheng Lin ; Wantong Huang ; Gautam Rai ; Yuguo Yin ; Lianyi He ; Qi-Kun Xue ; Stephan Haas ; Stefan Kettemann ; Xi Chen ; Shuai-Hua Ji ;
Date 2 Sep 2022
AbstractThe quantum many body states in the BCS-BEC crossover regime are of long-lasting interest. Here we report direct spectroscopic evidence of BCS-BEC crossover in real-space in a FeSe monolayer thin film by using spatially resolved scanning tunneling spectra. The crossover is driven by the shift of band structure relative to the Fermi level. The theoretical calculation based on a two-band model qualitatively reproduces the measured spectra in the whole crossover range. In addition, the Zeeman splitting of the quasi-particle states is found to be consistent with the characteristics of a condensate. Our work paves the way to study the exotic states of BCS-BEC crossover in a two-dimensional crystalline material at the atomic scale.
Source arXiv, 2209.00758
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